Metrological Properties of a Two-Output Transducer for Measuring Sum and Difference of Small Resistances

Adam Idzkowski, Wojciech Walendziuk, Pawel Swietochowski, Zygmunt Warsza


It presents an alternative realization of a circuit which supplies a resistance bridge, which has the form of a quadrilateral, equipped with two current sources and four electronic keys. The idea with alternately switched current sources allows to measure simultaneously small (up to 1 Ω) differences and sums of two changes in resistance taken from a pair of sensors plugged in the circuit. Problems relating to circuit realization and a way of signal processing are discussed. In the prototype transducer shielding and filtering RFI/EMI were used. The results of measurements conducted with the use of precision resistance decade boxes are presented.



Resistive transducers; sensors systems; measurement techniques; signal sampling; noise cancellation

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Print ISSN: 1392-1215
Online ISSN: 2029-5731